51000500 has 24 divisors (see below), whose sum is σ = 111386184. Its totient is φ = 20400000.

The previous prime is 51000491. The next prime is 51000511. The reversal of 51000500 is 500015.

It can be written as a sum of positive squares in 4 ways, for example, as 11587216 + 39413284 = 3404^2 + 6278^2 .

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50501 + ... + 51500.

It is an arithmetic number, because the mean of its divisors is an integer number (4641091).

Almost surely, 2^51000500 is an apocalyptic number.

51000500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51000500 is an abundant number, since it is smaller than the sum of its proper divisors (60385684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51000500 is a wasteful number, since it uses less digits than its factorization.

51000500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102020 (or 102008 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 11.

The square root of 51000500 is about 7141.4634354591. The cubic root of 51000500 is about 370.8441888278.

Adding to 51000500 its reverse (500015), we get a palindrome (51500515).

The spelling of 51000500 in words is "fifty-one million, five hundred", and thus it is an aban number.